Hi there, my inverter works fine ordered a two new 5kw inverters MSK II 5kw I have a problem with one it does not show utility AC when I switch AC on comes on though but does not show ac icon on display board nor connect no error codes works fine with Solar and Battery. Something prevents it switching to utility power have checked main cb input power is fine 228v 50Hz if some one have any info on this board I will appreciate it thank you.